Testing & Improvements
The prototypes created were designed to be tested by the target users of the spirometer device. However due to the COVID-19 pandemic access to testers was restricted, therefore, all prototypes had to be either remotely tested or self critiqued for this project. During testing key topics were observed including: functionality, ergonomics, utilisation, user experience and aesthetics
The interactive app prototype was tested by multiple users over zoom meeting which allowed them to remotely control the app through screen sharing. There were many useful takeaways from the testing of this prototype including adding an onboarding process explaining the different features of the app, adjustmenting how data was displayed and the addition of animations during the spirometry test guide instead of static images.
Using a self critiquing method to explore the ergonomics of the device I (50th percentile) was able to test how comfortable the device was to take a spirometry test and use alongside the charging hub. The spirometer was easy to hold in the hand and the angled shaped helped to maintain a good posture during testing. The charging hub was easy to use for a smartphone however charging the spirometer was required a bit more dexterity due to the small gap it sits inside of the hub.
The electronic prototype was an all round success; guiding me through the process of taking a spirometry test including repeating the test 3 times for accuracy. The whole test process took around 4 minutes to complete and receive the results. This testing process also allowed for the assessment of the mouthpiece for a 50th percentile user. The addition of LEDs to help the user understand the status of the device and the test was a nice feature. The air quality sensor was also tested separately subjecting it to standard household pollutants such as stove tops, aerosols and candles. The next step would be to try and implement the system into the body of the spirometer to gain realism of the final use case.
To test the behavioural change aspect of the design a simple challenge was set for the test users. Using a smart plug connected to a wireless charger and IFTTT complete a small task before going to bed to activate the charger. The task would be validated by completing a google form which in turn would turn on the smart plug. This test was carried out for a week with 3 users and the results were collated in a spreadsheet. The results found that there was an 86% completion rate across the testing period which is a large improvement from the 10-15% utilisation of peak flow meters. However due to the small sample size the test will need to be carried out with more testers before validating the results.
Using the Keyshot renders and the 3D prints the aesthetics were rated using an online survey. The survey consisted of opinions ranging from areas such as aesthetics, build quality, perceived value, complexity etc. Each question in the survey was linked to a balanced bipolar statement which the user could rate. Overall the 5 assessments were resoundingly positive with small recommendations such as changing colours of the body and button icons.